Hi,
I'm replaying to myself about the status on grounds in the simulation.
After including the search for ground in the simulation, and applying some
tweaks, all the tests pass now, including the one for the current source.
So now very basic circuits should work reliably.
The ground identification works based on the priority of being ground of
different nodes. Currently only nodes belonging to sources can be ground.
The search is performed on each connected set of nodes (so if there are 2
independent circuits on the document, both will have their own ground).
There are several tweaks in the ground search code, including:
- for 1 node, do nothing (circuit consisting of 1 voltage source)
- if all the nodes of the circuit would become ground, then again don't do
nothing (this was needed to fix one of the test cases...)
For the simulator core, the next logical steps are:
- make the reactive components work
- work on the digital simulation
- figure out how to implement subcircuit simulation
In parallel to these tasks, it's really high time to think about
integrating the simulator with the user interface. If we want to keep the
full history in git, then this is a nontrivial task, because the minimal
simulator branch has only the first commit common with the GUI code. is
there a possibility to rebase the whole minimal simulator to the master,
and then merge it?
Thank you for reading all this,
Zoltan
On Sun, 20 Mar 2011 23:09:47 +0100, Zoltan Padrah
recent:zoltan.padrah@gmail.com wrote:
Hello everybody,
in this email I'd like to summarize the current situation in the
development.
In my previous email to the list, I've started discussing the circuit,
component and connector deletion problems. Now there is progress, as a
deleted circuit will free all the references towards itself, so in this
regards there will be no more crashes.
The way components and connectors are deleted still has to be defined.
Now, if a connector is placed between 2 nodes belonging to different
components, when one component is deleted, the connector will be also
deleted. This can cause dangling pointers, so maybe the use of QPointer
will be really needed. Another problem is related with the allocation of
the objects: if the connector between two nodes is allocated on the
stack (not in the heap), then deleting it will crash the program. This
needs to be fixed.
During this week, some bugs have been also fixed, related to building
the project. Has anybody tried to build the minimal_simulator branch?
Recently I've focused on the current source component. The almost
trivial circuit, consisting of a resistor and current source currently
is not simulated currently, because the ground is not assigned in the
circuit, and due to this invalid/unsolvable equations appear in the
simulator.
By looking at the code, it seems that Circuit::identifyGround() method
is never called. Anybody has some idea how should the ground
identification work?
Later I will focus on fixing the ground identification, and meanwhile
I'm thinking of how to solve the component/connector deleting problem.
Also it would be really useful to start to integrate the
minimal_simulator branch into the used interface, as now simple circuits
(consisting of resistors and voltage sources) work. Also this way the
problem of deleting components or connectors from the circuit can be
better handled, because we will know what exactly is needed.
Regards,
Zoltan
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